X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Futils%2FBag.lhs;h=ed9a5407fbfd58c17085a97e1556e4a7a63c4f8f;hb=778b2c6bdbabf2c9f394f0ca2b76b55a7123aa5f;hp=546ad2fbc34ad81271b1320835a1f9e8814a6543;hpb=9dd6e1c216993624a2cd74b62ca0f0569c02c26b;p=ghc-hetmet.git

diff --git a/ghc/compiler/utils/Bag.lhs b/ghc/compiler/utils/Bag.lhs
index 546ad2f..ed9a540 100644
--- a/ghc/compiler/utils/Bag.lhs
+++ b/ghc/compiler/utils/Bag.lhs
@@ -1,5 +1,5 @@
 %
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
 %
 \section[Bags]{@Bag@: an unordered collection with duplicates}
 
@@ -10,7 +10,7 @@ module Bag (
 	emptyBag, unitBag, unionBags, unionManyBags,
 	mapBag,
 	elemBag,
-	filterBag, partitionBag, concatBag, foldBag, foldrBag,
+	filterBag, partitionBag, concatBag, foldBag, foldrBag, foldlBag,
 	isEmptyBag, consBag, snocBag,
 	listToBag, bagToList
     ) where
@@ -130,6 +130,16 @@ foldrBag k z (TwoBags b1 b2) = foldrBag k (foldrBag k z b2) b1
 foldrBag k z (ListBag xs)    = foldr k z xs
 foldrBag k z (ListOfBags bs) = foldr (\b r -> foldrBag k r b) z bs
 
+foldlBag :: (r -> a -> r) -> r
+	 -> Bag a
+	 -> r
+
+foldlBag k z EmptyBag        = z
+foldlBag k z (UnitBag x)     = k z x
+foldlBag k z (TwoBags b1 b2) = foldlBag k (foldlBag k z b1) b2
+foldlBag k z (ListBag xs)    = foldl k z xs
+foldlBag k z (ListOfBags bs) = foldl (\r b -> foldlBag k r b) z bs
+
 
 mapBag :: (a -> b) -> Bag a -> Bag b
 mapBag f EmptyBag 	 = EmptyBag